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In 1864, the first barbiturate (barbituric acid) was synthesized.

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The calories found in one piece of cherry cheesecake could light a 60-watt light bulb for 1.5 hours.

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In 1844, Charles Goodyear obtained the first patent for a rubber condom.

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A headache when you wake up in the morning is indicative of sinusitis. Other symptoms of sinusitis can include fever, weakness, tiredness, a cough that may be more severe at night, and a runny nose or nasal congestion.

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It is believed that the Incas used anesthesia. Evidence supports the theory that shamans chewed cocoa leaves and drilled holes into the heads of patients (letting evil spirits escape), spitting into the wounds they made. The mixture of cocaine, saliva, and resin numbed the site enough to allow hours of drilling.

Cardiac catheterization. Insertion of a tube called a catheter through a blood vessel. In this examp Cardiac catheterization. Insertion of a tube called a catheter through a blood vessel. In this examp
Photograph of the flea that transmits Yersinia pestis to cause bubonic plague, called the oriental r Photograph of the flea that transmits Yersinia pestis to cause bubonic plague, called the oriental r
Anterior view of abdomen divided by quadrants Anterior view of abdomen divided by quadrants
The Broad Range of Human Emotions. The Broad Range of Human Emotions.
The nucleus is bounded by a double membrane called the nuclear envelope The nucleus is bounded by a double membrane called the nuclear envelope
Different forms of a gene are called alleles Different forms of a gene are called alleles
Video: Language Areas Animation

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